It is very fast in the atmosphere: it's vulgar and it really sticks to the animated series. Without much spoiler, taking the place of a new inhabitant of South Park and your parents "directs" to make new friends ... You meet so Cartman and go for an epic adventure in search of the Stick of Truth . Basically, it is the starting pitch :)
Soon, we take pleasure in visiting the city and the houses (you can get almost anywhere) and references are (too) many. On this point, the hardcore fan of the series will miss a huge amount of small details slipped into the game, referring to the cartoon.
Gameplay side, if the keyboard controls are a bit complicated to handle (the mini game phases are clearly thoughts for a pad) and the interface of inventory is all rotten, you find yourself in a classic RPG with turn-based battles.
Too easy, start directly in expert mode, failing to finish the game too quickly !!!
The dialogues (original voice) are excellent although for my part I would have preferred the French voices are of truly exceptional quality.
Last, this PC version is not censored, unlike the PS3 and Xbox360 version requires STeam platform installed on your machine (if not already done ^^).
Clearly, this game is still reserved for big fans of the series. Crazy-good laughs in perspective :)